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Midterm Exam II

Navigation   » List of Schools  »  West Los Angeles College  »  Chemistry  »  Chem 051 – Fundamentals of Chemistry  »  Winter 2021  »  Midterm Exam II

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Below are the questions for the exam with the choices of answers:

Question #1
The name for Sn2+ is
A  selenium ion
B  strontium ion
C  sulfur(II) ion
D  strontium(II) ion
E  tin(II) ion
Question #2
True or false? One atomic mass unit (amu) is the mass (in grams) of one mole of the substance.
A  TRUE
B  FALSE
Question #3
Which of the following is a binary compound?
A  H2S
B  HCN
C  O2
D  NaOH
E  H2SO4
Question #4
True or false? In naming ionic compounds, the cation is always named first and the anion second.
A  TRUE
B  FALSE
Question #5
Potassium chlorate has the formula
A  KClO
B  KClO4
C  KClO2
D  KCl
E  KClO3
Question #6
A reaction that involves a transfer of electrons is called a(n) ______________ reaction.
A  precipitation
B  double-displacement
C  oxidation
D  oxidation-reduction
E  reduction
Question #7
The charge on a barium ion in its ionic compound is
A  +2
B  -1
C  +3
D  Various charges are possible.
E  +1
Question #8
The correct formula for ammonium sulfate is
A  (NH3)2SO3
B  (NH4)2SO4
C  NH4SO4
D  NH4SO3
E  (NH4)2SO3
Question #9
The correct name for FeO is
A  iron oxide
B  iron monoxide
C  iron(II) oxide
D  iron(III) oxide
E  iron(I) oxide
Question #10
The name for NaHCO3 is
A  sodium carbonate
B  sodium hydrogen carbonate (sodium bicarbonate)
C  sodium(I) hydrogen carbonate
D  sodium(I) bicarbonate
E  none of these
Question #11
The equation 2Al(s) + 2Br2(l) → 2AlBr3(s) is a(n) ______________ reaction.
A  combustion
B  decomposition
C  oxidation-reduction and synthesis
D  oxidation-reduction only
E  synthesis only
Question #12
True or false? A mole ratio is used to convert the moles of a starting substance to the moles of a desired substance.
A  FALSE
B  TRUE
Question #13
The binary compound PCl3 is called
A  triphosphorus chloride
B  monophosphorus trichloride
C  phosphorus chloride
D  phosphorus trichloride
E  none of these
Question #14
Titanium(IV) oxide has the formula
A  TiO2
B  Ti4O2
C  Ti4O
D  Ti(IV)O
E  TiO4
Question #15
The correct formula for the carbonate ion is
A  CO4-
B  CO42-
C  CO3-
D  CO33-
E  CO32-
Question #16
Which represents the greatest mass?
A  1.0 mol Al
B  1.0 mol Cu
C  1.0 mol Zn
D  all the same
E  1.0 mol Fe
Question #17
The name for Al(OH)3 is
A  aluminum(III) hydroxide
B  monaluminum trihydroxide
C  aluminum(I) hydroxide
D  aluminum trihydroxide
E  aluminum hydroxide
Question #18
One mole of something consists of ____________ units of that substance.
A  6.022×1023
B  1.008
C  1.66×10-24
D  32.00
E  12.01
Question #19
The correct formula for lead(IV) nitrate is
A  Pb2(NO3)4
B  Pb(NO3)4
C  PbNO3
D  Pb(NO3)2
E  Pb4NO3
Question #20
True or false? A sample of an element with a mass equal to that element’s average atomic mass expressed in grams contains one mole of atoms.
A  FALSE
B  TRUE
Question #21
The name of the compound NH4ClO4 is
A  ammonium hypochlorate
B  ammonium chlorite
C  ammonium chloride
D  ammonium perchlorate
E  ammonium chlorate
Question #22
The formula for the compound formed from ammonium and sulfate ions is
A  NH4(SO4)2
B  none of these
C  (NH4)2SO4
D  NH4SO4
E  (NH4)3SO4
Question #23
True or false? A balanced chemical equation is one that has the same number of moles of molecules on each side of the equation.
A  TRUE
B  FALSE
Question #24
True or false? The equation N2(g) + 3H2(g) → 2NH3(g) can be interpreted by saying that 1 mol of N2 reacts with 3 mol of H2 to form 2 mol of NH3.
A  TRUE
B  FALSE
Question #25
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case?
Reference: Ref 6-2

N2(g) + O2(g) → N2O3

A  6
B  3
C  1
D  2
E  4
Question #26
The name for NH4Br is
A  nitrogen hydrogen bromide
B  none of these
C  ammonium(I) bromide
D  ammonium bromide
E  nitrogen tetrahydrogen bromide
Question #27
The carbonate ion has the formula CO32-. What is the correct formula for sodium carbonate?
A  Na2(CO3)2
B  NaCO3
C  Na2CO3
D  Na(CO3)2
E  Na3(CO)2
F    
Question #28
The substance ClO3- is best described as
A  a polyatomic ion
B  a molecule
C  a polyatomic molecule
D  a mixture
Question #29
Which of the following represents the hypochlorite ion?
A  ClO-
B  Cl-
C  ClO3-
D  ClO2-
E  ClO4-
Question #30
Which represents the greatest number of atoms?
A  50.0 g Al
B  50.0 g Fe
C  50.0 g Zn
D  50.0 g Cu
E  all the same
Question #31
The correct name for the Al3+ species is
A  aluminum
B  aluminum(III) ion
C  aluminum ion
D  aluminum(3A) ion
E  trialuminum ion
Question #32
What is the formula for cobalt(II) chloride?
A  CCl2
B  Co2Cl
C  CoCl2
D  C2Cl
E  CoCl
Question #33
The correct name for LiCl is
A  monolithium monochloride
B  lithium(I) chloride
C  lithium chloride
D  monolithium chloride
E  lithium monochloride
Question #34
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case?
Reference: Ref 6-2

Pb(s) + AgNO3(aq) → Pb(NO3)2 + Ag(s)

A  1
B  6
C  5
D  4
E  2
Question #35
Which of the following formulas is incorrect?
A  Mg(OH)2
B  NaBr
C  AlCl3
D  CsCl2
E  Li2S
Question #36
The equation 2Ag2O(s) → 4Ag(s) + O2(g) is a(n) ______________ reaction.
A  oxidation
B  combustion
C  synthesis
D  decomposition
E  none of the above
Question #37
The correct name for P2O5 is
A  phosphorus pentoxide
B  phosphorus(V) oxide
C  diphosphorus oxide
D  phosphorus(II) oxide
E  diphosphorus pentoxide
Question #38
The correct formula for iron(III) phosphide is
A  FeP
B  Fe3P2
C  FeP3
D  Fe2P3
E  Fe3P
Question #39
The correct formula for lead(II) sulfite is
A  PbSO3
B  PbSO4
C  L2SO4
D  Pb2SO3
E  LSO4
Question #40
The molar mass of blood sugar, C6H12O6, also known as glucose and dextrose, is
A  108.10 g/mol
B  none of these
C  180.16 g/mol
D  6.02 × 1023 g/mol
E  168.06 g/mol
Question #41
How many molecules of O2 are there in 7.9 mol of O2?
A  253
B  4.8 × 1024
C  7.6 × 1022
D  1.3 × 10–23
E  4.05
Question #42
True or false? Oxidation and reduction must occur simultaneously.
A  FALSE
B  TRUE
Question #43
Sodium chlorite has the formula
A  NaClO4
B  NaCl
C  NaClO3
D  NaClO2
E  NaClO
Question #44
The formula for calcium hydrogen sulfate is
A  CaS2
B  Ca(HSO4)2
C  Ca2HSO4
D  Ca(SO4)2
E  Ca2S
Question #45
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case?
Reference: Ref 6-2

C2H6(g) + O2(g) → CO2(g) + H2O(g)

A  7
B  10
C  14
D  8
E  4
Question #46
The name for SrCl2 is
A  strontium dichloride
B  strontium(II) chloride
C  strontium(I) chloride
D  strontium(I) chloride(II)
E  strontium chloride
Question #47
Classify the following reaction:
2Mg(s) + O2(g) → 2MgO(s)
A  oxidation-reduction
B  oxidation-reduction, combustion, synthesis
C  synthesis
D  combustion
E  none are correct
Question #48
When the equation Si(s) + HF(aq) → SiF4(g) + H2(g) is balanced, what is the coefficient for HF?
A  3
B  0
C  2
D  4
E  1
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